Biologically, vasopressin - a powerful hormone released by men and women during orgasm - is released to strengthen feelings of attachment between partners whilst oxytocin - a hormone released during childbirth - deepens the mutual feelings of attachment.While all five stages are intricately and clearly defined, researchers have noted that life events can impact an individual's progression.Psychologist Dr Linda Papadopoulos, who assisted with the research, said: "Shaped via a mixture of physical and emotional indicators, it's fascinating to note that this one core emotion can be broken down into such distinct stages."What's more, each stage may be relived and recaptured as couples grow into a relationship, and face different life challenges together."The couples filled with questions about how the relationship impacted various aspects of their lives.Building - getting to know your partner inside out (three per cent) * Lack of sleep * Decreased attention span * 'Happy anxiety' - as a result of the release of monoamines Stage 3.Assimilation - negotiating a future together (10 per cent) * Increase in stress levels Stage 4.Your ANS helps to prepare you for what you think is going to happen, an evolutionary vestige left over from when we'd have to run screaming from a lion in order to survive.
The first time I ever felt butterflies in my stomach was when I was 14 years old.At that moment, however, I was devastated because he didn't want to be with me, and I couldn't understand why."I felt butterflies with him," I'd told my therapist.But there is biological evidence to support my therapist's hypothesis.It's all has to do with your autonomic nervous system (ANS), which dictates your "fight-or-flight" response.